メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421851088096 43.7652308932458, 142.421244402481 43.7652823891661, 142.420653772985 43.7653066088733, 142.420564850713 43.7642598007764, 142.421136677849 43.7642336566181, 142.421754117426 43.7641977037664, 142.421790627674 43.7647483783815, 142.421851088096 43.7652308932458)) ^^http://www.opengis.net/ont/geosparql#wktLiteral